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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f02883ff77150148695d2a6e40cf8a21a602f82dd4b90b9a17c4b8d1ceb8cb' 
  AND token = 'q7ygYGur6HV2DEW3RARZBqRSLurYWaBgBFeAAPdLtD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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