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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee408575bc8f9e1cf32fb1017fd86ced7488c78d1c0eb25c2d352537797f33e2' 
  AND token = 'pTwYytmWINC7ie94cFr9+a2boT8QguN8pagofrex9sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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