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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2994edf9d21e343ac68a1204bf3f3355786060ff2f34c848d1d3c4cf73336d' 
  AND token = 'uSQc03B6NN9rDUSfa7JC+P4GJLmfh+6rFREq+vQNnvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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