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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4f9c32d3445f0d8bbb17c4ca8086e530451076e34ce9322abfe8c928d03bea' 
  AND token = 'QyG6+I0VAHFUXgl9WockcA4Sien1RSuR1pfgaVc58ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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