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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb90b93d0603f746e959837aff5236733dbe3b1779f294d224aaf06dc2b5eab1' 
  AND token = 'SiDklU3oyxHVIG+cR7xHSvjbzy761F4ltjWsUXiB3n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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