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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8812377d258162c45f45dea5c386000467093cd1dd721d542ef5f3ed722f7c2' 
  AND token = 'fG6maGNCWKYSjlxhQ4qRt9KmP0D1av5hf+s5QOqBRL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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