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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b69b2bb5e63f9d4c09fc0ef4fac4ec37259c590b77214fd2e89d0848a845493' 
  AND token = 'rZNRExlvypSx3Fw1XpVRYLEBEFRTh9E9Qz8rG116yTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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