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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32405804c3009f43f9bca0caa18e10c0150f5bbb0cd0e26bec9ca27b65275c05' 
  AND token = 'OoYTZTaZy0KJVxzOfBXHex9PwuQ45XCYf3Qemu6grtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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