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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5403c9e7637c1d37db0fb2f264e7d5106502d488f0f4c11038ef007de1e36d3' 
  AND token = 'hOvxGnkmeV7b/nLLf/voLwLrfum6vOtsPHRHJtBg7sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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