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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a3e35db1d1da8e398ab84d1f59acb1d5dd6683fa65b8430e163026e6b43e70' 
  AND token = 'E+AGvtUai08UHI8dDTfuVSs2nmOtK8LHrjM8zSVEmJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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