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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84abfca0e96991986d1db98fc2f3880598d0d4fa94a5b591e5af5351f7695180' 
  AND token = 'qb0xHw670ppMoab+HlKWB0Xe3mpYZQh7t83U1IyNMXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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