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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2930d25be64942ff20a409351ca2b80097dc2b8b80d302b3a7e4936d0a3c082e' 
  AND token = 'Yf0CH2TlCvyFEu00mhw6La797akwQV39nncA1KcJ9D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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