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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b44fdbf6fe34627ef26c0cf33c8783970d92c48c0eea2981e655ffb9082f36' 
  AND token = 'w2Fk924MX3cvBqi3zC4x+AIDTdOXx6FKQnSVpasKBIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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