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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a191058e8dc9830ad7680e882c1cd7c1665ee85a211b67bd7fbd2df778b8787' 
  AND token = 'JAMzLPOrIjbbOmXLtd/sPzDEUE1taPdxocdokI0cWaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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