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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5201f4d481bbc608678cd7f8a01e8c38d5dc079bd8a3955f33c95edc6885df56' 
  AND token = 'fv4E3jKGt6TPTC3nbI2kdjrXD4bRM1TIqGhvARr639c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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