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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e8102677834becaee50ef57a604f42078f8ad591eb91985d36d58ec49208b1' 
  AND token = 'M5ZJLN71a9DQef/JBClxAVOk+b7010+tB/mzVbvHZt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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