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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ad6e4d7152090eaf041efa677007dd5a05ca3b8c53369efb56f0b0a11b3175' 
  AND token = 'zPlxSt2sbFzthBXcA6SBA10jQWaICpEYpvTSrksU+dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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