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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8bb40dde666038fc38c6af7596b38a0e3f6c590e5b0a6226b0351f464aa0ab' 
  AND token = '/ddVzk5gnPH0yqVRD1+IMmxcCDz2lvPQUktbrfoD7ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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