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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6376cda8ad6ad41e390480d5b00bcec4aa3edfeefd2efae7dcfe4a216d62dab' 
  AND token = 'HWl2mXtL8CrwnFsOVndLQ+nr0pwLWJ/7s6oUj8G1PlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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