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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565e02c7ab41e9528bf7392b3426490553cf1b4f580ce15b63acb22f3cf2f4bd' 
  AND token = 'cmb+waMaPEFEJZikm1hqYjabp191hhHkCt7QaLnucZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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