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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad815281f0658e30551b1bba05fb2322c5629ae664b897a3452a65cdf9688c7' 
  AND token = 'Yfk6Ly/oEWwKnUbje3lV7oGE6ANOzdileNPoK2MNQDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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