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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4492853964d6160520e150df24f2d9b79f4c11bd3bdb0b40c9753d9cf474824' 
  AND token = 'eKm+P77S7LMfxpYszqOegI9QzDe90qVDeHlXqIe6odA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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