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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2315b28680be3e1d2f970c5ff14eeaedc36092f895fe6f6ef8be803013e4899f' 
  AND token = 'M5q1vBd2poLnaBhEExzWs9x0xrq6tnGqOATsNMv7tA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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