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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34482ae3df7da9772153dc2b12133fc436d14507e5ecd5a2e53420191bcc6f95' 
  AND token = 'arFjwzOPHAiXmIatttir4KgBOJ1KDa5VMEbA5SgFrdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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