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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70359910527ec74bca3e927c1568353131eb428c18ec7ecc729396c96eea6b2e' 
  AND token = 'SJ+adurA2qRf6JbtC1HV1r3fUGY68zJ0SbfliVCGn0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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