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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '776d54fe7d6e101724148424684c1dde76558379e805eed09aec63ed811bec45' 
  AND token = 'CKE2W4aU6WIWAzM5pg85eAZt6mzzxe8fjnuCe+6ZvH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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