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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c5c334834799c2e97975576db509bfd1e02b828ea97ed4feafab64f5474715' 
  AND token = 'Y6a7MA6iMr191z0S2oS88CxvCd0Kc3zdGrCopcHCpbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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