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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313f7aa605c29cf708c67091b0f0a31bf3057a0e65ce6d2ad93f4b86bdfe0292' 
  AND token = 'G/TN0/lwCnRs6JXsHtsGg/wgh7JUcy79B2n0Qox04uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}