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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '729bc83ac3af1028733bf6dde917193b38a9e1dc41b5b6daa0740aa13292cc9f' 
  AND token = 'kH+EhEuYXmU4P87Rt6sctfoidKao9iGJrZWWwwA62+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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