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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba704328a8e5cade9847e156545c827ca109862d6f2e5b28bbe986fed09ea42' 
  AND token = 'eT6OclQXG1MFv5oOlDvrDHvz2uZrXnOiNUp2GGqikfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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