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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54d71a52aeda76aa4959435ab94f08170b8c1cc94d0d4589f774874bd9ba2b2e' 
  AND token = 'Sn0cs69D8bpZBTMn0Tk61WvZVtwLSXyuLQoL+2ndFQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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