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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c7416a5cb03086ddd6b943d344b47d973dd7aefb1142d1af95a405f17b413b' 
  AND token = 'pAmKc0Ib2eyKm1SomDfyB7XNWd4Irxw6ztMi32Y33Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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