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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d206237990d876e0583ecf495a8b1f60f0803cc6cea15a907e09a5952d0eaa6' 
  AND token = 'eMA3o+m0EBUujDlK49LkFvfPyRgzs5VhP2CIV+ARyUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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