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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2d8324eee07acdbca0f4db084f03a12ad7f1d0bf6d47075a8c6d0fd2c0e449' 
  AND token = '8kN+HPc2wXeoAKC2r9MjV93fYPKXtHlVRG0e/KB6rMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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