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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b00e7e684702fb7d6da32c24a640dfc8822fc00fb38951132e0f38f81ae7785' 
  AND token = '+2NHEhs5pZswGfoW65Zy4dOUK1aSG8z71q8+2BsuBZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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