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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23077044549dd7e7c65f6cdc70fd4797ef9394f654587e11af8e432ad10b304' 
  AND token = '10RPpynb1+Gbj0f89VLBksXVF3UaOrO/h85t5TR/5BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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