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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910c1a38af9a90ab787f38b4551200158037a098c71f380933774d4555f08b9c' 
  AND token = 'ruvNpT7ddL3g0dtHuI+n2rQ2Cke8i8gD47MPQi9ZemA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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