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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6cf851114f1c6cba6730a89a7b6bf5bc3027c3d1a6ad13284e189f2db53dd25' 
  AND token = 'poywGW5KwowMr/8U5ahfWZf7tONiyKfo+ul564UW1yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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