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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6954a0af9845f834a18d88058019542c86d88f8da2cbf11d91f3921ab3a18f' 
  AND token = 'Z9te3hvy44z8UBRPlfknSmRoKfxQVHOcO1SHoha34ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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