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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead9f5d3507089906bd9b6b72fe034a1b9fa5b9639e9e814e68a43c011caade5' 
  AND token = '0ODjDwP4UNmrWzjn8W2NclgfEnxehJhbl69F4+H9upQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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